REGA Planet 2000 vs. Planet '3'

I realize there is no "Planet 3" CD player, but how can I tell if a Rega Planet 2000 has teh most recent upgrades to the lid and power supply (which warrants some to refer to the new ones as the "planet 3")? Is there a certain mfr date after which all player have the updates? Are there physically visible differences between teh two? Any info at all is appreciated. Thanks.